Currently the IAF has around 154 Mig21s , 85 Mig27s and 145 Jaguars.
Till 2020 , IAF is inducting atleast 70 Su-30MKIs , 40 Tejas mk1 and 36 Rafales = 146 Jets. This will replace all 85 Mig27s and 61 Mig21s.
93 Mig21s left will be retired by 2025 against the Tejas mk2.
2025 onwards there will...